Tree stand



FIG. 1 is a side elevational view of a tree stand showing my new design, all sides being identical;

FIG. 2 is a top plan view thereof; and,

FIG. 3 is a bottom view thereof.

The thumb screw shown in dotted line in FIG. 1 is not considered to be part of the design. 

The ornamental design for a tree stand, as shown and described. 